#include<cstdio>
#include<iostream>
#include<vector>
#include<algorithm>
#include<string>
#include<cstring>
using namespace std;

typedef long long LL;
typedef vector<int> VI;

#define REP(i,n) for(int i=0; i<int(n); i++)
#define EACH(i,c) for(__typeof((c).begin()) i=(c).begin();i!=(c).end();i++)

string oda = "oda", yukiko = "yukiko";
string name;
int cnt;
int main() {
    cin >> name;
    REP (i, 8) {
	string s;
	cin >> s;
	cnt += count(s.begin(), s.end(), 'b');
	cnt += count(s.begin(), s.end(), 'w');
    }

    if (cnt % 2 == 0) cout << name << endl;
    else if (name == oda) cout << yukiko << endl;
    else cout << oda << endl;

    return 0;
}